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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents d2c90368aeef
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1 #ifndef CYGONCE_KERNEL_MUTEX_HXX
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2 #define CYGONCE_KERNEL_MUTEX_HXX
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3
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4 //==========================================================================
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5 //
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6 // mutex.hxx
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7 //
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8 // Mutex class declarations
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9 //
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10 //==========================================================================
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11 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license/
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): nickg
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47 // Contributors: nickg
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48 // Date: 1997-09-09
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49 // Purpose: Define Mutex class interfaces
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50 // Description: The classes defined here provide the APIs for mutexes
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51 // and condition variables.
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52 // Usage: #include <cyg/kernel/mutex.hxx>
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53 //
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //==========================================================================
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58
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59 #include <cyg/kernel/ktypes.h>
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60 #include <cyg/infra/cyg_ass.h> // assertion macros
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61
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62 #include <cyg/kernel/thread.hxx>
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63
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64 // -------------------------------------------------------------------------
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65 // Mutex.
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66
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67 class Cyg_Mutex
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68 {
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69 friend class Cyg_Condition_Variable;
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70
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71 cyg_atomic locked; // true if locked. This may seem
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72 // redundant due to "owner" below,
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73 // but is intentionally present for
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74 // future SMP support.
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75
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76 Cyg_Thread *owner; // Current locking thread
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77
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78 Cyg_ThreadQueue queue; // Queue of waiting threads
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79
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80 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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81
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82 public:
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83 enum cyg_protcol
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84 {
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85 NONE = 0, // no inversion protocol
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86 INHERIT, // priority inheritance protocol
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87 CEILING // priority ceiling protocol
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88 };
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89
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90 private:
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91 cyg_protcol protocol; // this mutex's protocol
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92
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93 #endif
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94
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95 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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96
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97 private:
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98 cyg_priority ceiling; // mutex priority ceiling
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99
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100 #endif
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101
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102 public:
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103
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104 CYGDBG_DEFINE_CHECK_THIS
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105
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106 Cyg_Mutex(); // Create in unlocked state
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107
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108 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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109
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110 Cyg_Mutex( cyg_protcol protocol ); // Create with defined protocol
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111
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112 #endif
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113
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114 ~Cyg_Mutex(); // Destructor
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115
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116 cyg_bool lock(); // lock and/or wait
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117
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118 cyg_bool trylock(); // try to lock and return success
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119
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120 void unlock(); // unlock
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121
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122 void release(); // release all waiting threads
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123
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124 // Get the current owning thread
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125 inline Cyg_Thread *get_owner() { return owner; }
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126
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127 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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128
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129 // set ceiling priority for priority ceiling protocol
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130 void set_ceiling( cyg_priority priority );
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131
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132 cyg_priority get_ceiling(void) { return ceiling; };
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133
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134 #endif
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135
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136 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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137
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138 // set inversion protocol
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139 void set_protocol( cyg_protcol new_protocol );
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140 #endif
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141
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142 };
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143
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144 // -------------------------------------------------------------------------
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145 // Condition variable.
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146
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147 class Cyg_Condition_Variable
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148 {
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149 Cyg_Mutex *mutex; // Associated mutex
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150
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151 Cyg_ThreadQueue queue; // Queue of waiting threads
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152
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153 // Private internal implementation function for wait operations
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154 cyg_bool wait_inner( Cyg_Mutex *mutex );
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155
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156 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT
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157
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158 // Private internal implementation function for timed wait operations
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159 cyg_bool wait_inner( Cyg_Mutex *mutex, cyg_tick_count timeout );
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160
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161 #endif
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162
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163 public:
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164
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165 CYGDBG_DEFINE_CHECK_THIS
115
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166
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167 Cyg_Condition_Variable(); // simple constructor
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168
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169 Cyg_Condition_Variable(
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170 Cyg_Mutex &mutex // linked mutex
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171 );
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172
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173 ~Cyg_Condition_Variable(); // Destructor
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174
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175
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176 void signal(); // Set cond true, wake one thread
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177
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178 void broadcast(); // Set cond true, wake all threads
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179
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180 // Wait for condition to be true
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181 inline cyg_bool wait() { return wait_inner( mutex ); }
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182
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183 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT
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184
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185 // Wait until a signal or timeout expiry
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186 inline cyg_bool wait( cyg_tick_count timeout )
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187 { return wait_inner( mutex, timeout ); }
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188
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189 #endif
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190
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191 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_WAIT_MUTEX
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192
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193 // Wait for condition to be true using the supplied mutex
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194 inline cyg_bool wait( Cyg_Mutex &mx ) { return wait_inner( &mx ); }
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195
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196
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197 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT
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198
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199 // Wait until a signal or timeout expiry, using the supplied mutex
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200 inline cyg_bool wait( Cyg_Mutex &mx, cyg_tick_count timeout )
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201 { return wait_inner( &mx, timeout ); }
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202
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203 #endif
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204 #endif
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205
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206 // Return a pointer to this variables thread queue. Used mainly
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207 // for testing whether a thread is on the queue for a particular
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208 // cv.
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209 inline Cyg_ThreadQueue *get_queue() { return &queue; };
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210
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211 };
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212
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213
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214 // -------------------------------------------------------------------------
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215
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216 #endif // ifndef CYGONCE_KERNEL_MUTEX_HXX
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217 // EOF mutex.hxx